SA2478SW
Installation of Lycoming IO-720- B1B engine and increase take-off and landing weight to 7800 lbs. Held by Rpm Commander LLC, which holds 5 approved modifications in all. Last revised April 16, 2008. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Twin Commander Aircraft Corporation
- Models
- 500-S
- Type certificate
- 6A1
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 22, 2026.